UINavigationBar自定义标题位置 [英] UINavigationBar custom title position

问题描述

我有一个自定义的UINavigationBar（不同的大小，背景等），在自定义标题视图内。我使用这个代码实现这个：

I have a custom made UINavigationBar (different size, background etc) that has inside a custom title view. I used this code to achieve this:

UIView * mainView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];
    mainView.backgroundColor = [UIColor yellowColor];

    UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0,0,kScreenWidth,80)];
    navBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;

    UINavigationItem *currentItem = [[UINavigationItem alloc] init];
    UILabel *label = [[UILabel alloc] init];
    label.font = [UIFont fontWithName:@"Helvetica-Bold" size: 30.0];
    [label setBackgroundColor:[UIColor clearColor]];
    [label setTextColor:[UIColor whiteColor]];
    [label setText:self.title];
    [label sizeToFit];
    [currentItem setTitleView:label];
    [label release];

    [navBar pushNavigationItem:currentItem animated:NO];
    [currentItem release];

    [mainView addSubview:navBar];
    [navBar release];    

    self.view = mainView;
[mainView release];

然而，我的问题是，即使自定义标题视图被正确添加，以NavBar为中心。

However, my problem now is that, even if the custom title view is correctly added, it's not vertically centered with the NavBar. What I am missing?

谢谢！

推荐答案

setTitleVerticalPositionAdjustment：forBarMetrics：在 IOS 5 改变标题位置，它工作在正常的标题如：

You can use setTitleVerticalPositionAdjustment:forBarMetrics: in IOS 5 to change the title position, it works on normal title e.g.:

CGFloat verticalOffset = -4;
[[UINavigationBar appearance] setTitleVerticalPositionAdjustment:verticalOffset forBarMetrics:UIBarMetricsDefault];

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